If you want the image rendered as it would look ready-to-run inside of the rkt stage2 then use rkt image render.
NOTE: this will not use overlayfs or any other mechanism.
This is to simplify the cleanup: to remove the extracted files you can run a simple rm -Rf.

Options

Flag

Default

Options

Description

--overwrite

false

true or false

Overwrite output directory

--rootfs-only

false

true or false

Extract rootfs only

rkt image gc

You can garbage collect the rkt store to clean up unused internal data and remove old images.

By default, images not used in the last 24h will be removed.
This can be configured with the --grace-period flag.